Glossary: C
To fine-tune video levels for maximum clarity during recording or
digitizing (from videotape).
An effect that converts the format of source data during playback. For
example, it could convert video frame data between PAL (25áfps) and
NTSC (29.97áfps) formats.
ComitΘ Consultatif International des Radio Communications. A mainly
European organization similar to SMPTE (Society of Motion Picture and
Television Engineers) in the United States that includes user and vendor
representatives. Now called ITU (International Telecommunication
Union).
A list of instructions produced by Film Composer that is used to track and
compare the differences between two versions of a digital sequence. A
change list is used to update a work print cutting with specified new edits
and revisions.
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A physical audio input or output.
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One of several color components that combine to define a color image.
An RGB image is made up of red, green, and blue color channels. In
color correction, you can redefine color channels by blending color
components in different proportions.
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An electronic device, or a computer device and software combination, that
creates letters and numbers that can be superimposed on video footage as
titles.
The housing for removable disk modules. The chassis contains a power
supply, drives, and connectors for each module.
Video color.
A trademark of Avid Technology, Inc. ChromaCurve graphs appear in the
Color Correction tool and are used to adjust the color values in a sequence.
The graphs plot input values on the horizontal axis and output values on
the vertical axis. The background color in the graph represents the color
adjustment in the corrected sequence, and the curve on the graph (created
by the user) increases or decreases the amount of that color in the corrected
sequence.
A method of combining images or parts of images from two different
sources by replacing a solid color in one source with a picture from the
second source.
A trademark of Avid Technology, Inc. ChromaWheel controls appear in
the Color Correction tool and are used to adjust hue and saturation in a
sequence. ChromaWheel controls provide an adjustment method that is
similar to the physical controllers on traditional color correction
equipment, with the addition of a color background that graphically
represents the hue and saturation values being adjusted.
The saturation and hue characteristics of a composite video signal; the
portion of the video signal that contains color information. Adjust
chrominance and other video levels before recording or digitizing.
The transfer of media files in segments so other workgroup users can
access and use the media before complete files have been sent.
Videotape damage due to creasing or folding.
A take from a film shoot that has been marked for use or printing by a
circled number on the camera report.
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A segment of source material recorded or digitized into your system at
selected IN and OUT points and referenced in a project bin. The clip
contains pointers to the media files in which the actual digital video
and audio data is stored.
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In a record in a log, which stands for one shot, the clip includes
information about the start and end timecode for the shot, the source
tape name, and the tracks selected for editing.
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In OMFI, a general class of objects in the OMFáInterchange class
hierarchy representing shared properties of source clips, filler clips,
attribute clips, track references, timecode clips, and edge code clips. A
clip is a subclass of a component.
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A nonsequential method of assembly in which the edit decision list (EDL)
is arranged by source tape number and ascending source timecode.
Compressor/decompressor. Any technology for compressing and
decompressing data. Codecs can be implemented in both software and
hardware. Some examples of codecs are: Cinepak, MPEG, and QuickTime.
The adjustment of the relative levels of color signals to produce the best
quality image or effect.
A standard color test signal, displayed as a video pattern of eight equal
width columns (that is, "bars") of colors. SMPTE color bars are a common
standard. You adjust video levels against the color bars on your source
videotape before recording or digitizing.
The process of adjusting the color characteristics of video material to
achieve an accurate representation of color and consistency of color from
one clip in a sequence to another. The term generally refers to adjustments
made across all the video in a program rather than to individual color
changes made as part of a single effect.
A sequence of video fields required to produce a complete pattern of both
field and frame synchronization and color subcarrier synchronization. The
NTSC system requires four fields; PAL requires eight.
The color synchronizing signal included as part of the overall composite
video signal. When compared with the color subcarrier signal, the color
reference burst determines the hue of the video image.
The process of selecting color and density values for a film before film
printing.
A circular graph that maps hue values around the circumference and
saturation values along the radius. Used in the Color Correction tool as a
control for making hue offset and secondary color correction adjustments.
The structuring of the video signal whereby color and luminance signals
are kept separate from one another using the color-subtraction method Y
(luminance), B–Y (blue minus luminance) and R–Y (red minus
luminance), with green derived from a combination. Two other component
formats are
RGB and
YUV.
A film print containing both picture and sound.
A sound track containing all required sound elements — usually dialog,
music, and effects mixed in correct proportions.
A video signal in which the luminance and chrominance components have
been combined (encoded) as in standard PAL, NTSC, or SECAM formats.
The process of layering two or more images on top of one another.
Examples include titles, keys, and picture-in-pictures.
The standard term used by OMFáInterchange to refer to an edited sequence
made up of a number of clips. The OMF equivalent of a sequence in an
Avid system.
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In audio, the process of reducing the dynamic range of the audio
signal.
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In video, a lack of detail in either the black or the white areas of the
video picture due to improper separation of the signal level.
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A reduction of audio signal detail, video signal detail, or both to reduce
storage requirements during transformation from analog to Avid
digital format. In JPEG compression, for example, algorithms for
variable frame length analyze the information in each frame and
perform reductions that maximize the information retained.
Compression does not remove any frames from the original material.
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A measurement, expressed as a percentage, of the probability that the
pattern the system finds during a motion tracking operation is identical to
the pattern for which the system is searching. During a motion tracking
operation, Avid Symphony calculates a confidence value for each tracking
data point it creates.
To prepare a complete version of your project for viewing. The version
produced might be an intermediate working version or the final cut.
conforming a film
negative
The mathematical process that the editing system uses to ensure that the
edits made on a videotape version of a film project (30áfps) are frame
accurate when they are made to the final film version (24áfps).
A display that lists the current system information and chronicles recently
performed functions. It also contains information about particular items
you are editing, such as the shots in your sequence or clips selected from
bins.
To make copies of media files or portions of media files, and then save
them on a drive. The Consolidate feature operates differently for master
clips, subclips, and sequences.
The range of light-to-dark values present in a film or a video image.
A location on a BΘzier curve that controls its direction. Each control point
has two direction handles that can extend from it.
The portion of the video recording used to control longitudinal motion of
the tape during playback. Control track can be thought of as electronic
sprocket holes on the videotape.
Central processing unit. The main computational section of a computer
that interprets and executes instructions.
An edit that is electronically unstable, such as one made using the pause
control on a deck, or using a noncapstan served deck.
Text that moves horizontally over time. Examples include stock and sports
score tickers that appear along the bottom of a television screen.
The redefining of image boundaries, usually by electronically removing
the top, bottom, left, or right sides of the image.
An audio transition in which the outgoing sound gradually becomes less
audible as the incoming sound becomes more distinct. Also called an audio
dissolve.
The reduction of detail in the black regions of a film or a video image by
compressing the lower end of the contrast range.
Close-up.
To shuttle a videotape to a predetermined location.
An X, Y graph that plots input color values on the horizontal axis and
output color values on the vertical axis. Used in the Color Correction tool
as a control for changing the relationship between input and output color
values.
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An instantaneous transition from one video source to another.
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A section of source or record tape.
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A series of output lists containing specifications used to conform the film
work print or negative.